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Carbon-wrapped amorphous Ni–Co binary oxide nanosheet for high-performance pseudocapacitors

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Abstract

The development of high-energy density supercapacitor demands that the electrode has the characteristic of good conductivity for electron and open framework structure and ion transfer. NiCo2O4 already exhibits superior electric conductivity among the multi-metal oxides. Here, carbon-wrapped amorphous Ni–Co oxide nanosheet is prepared by a hydrothermal method, followed by an annealing process in Ar atmosphere. The conductivity is further improved by carbon coating and it also has a more open structure, which is verified by extended X-ray absorption fine structure analysis. Owing to the advantage of its structure, the carbon-wrapped amorphous Ni–Co oxide shows large capacitance of 1775 F g−1 at 1 A g−1 in three-electrode aqueous system, high energy density of 73.5 Wh kg−1 and power density of 806.7 W kg−1 in asymmetric supercapacitors. The open framework feature of the amorphous would promote the wide exploration of amorphous Ni–Co oxide material as the electrode for energy storage devices.

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Acknowledgements

The authors acknowledge the financial support from the Fund for Natural Science Foundation of Shaanxi Provincial Department of Education (No.20JS042).

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Author notes

  1. Jialin Guo and Wenjing Li have contributed equally.

Authors and Affiliations

  1. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, College of Chemical Engineering and Modern Materials, Shang Luo University, Shang Luo, 726000, Shaanxi, People’s Republic of China

    Jialin Guo

  2. Xi’an International Medical Center Hospital, Xian, 710021, Shaanxi, People’s Republic of China

    Wenjing Li

  3. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, Shaanxi, People’s Republic of China

    Peng Zheng

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  1. Jialin Guo
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  2. Wenjing Li
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Correspondence to Peng Zheng.

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Guo, J., Li, W. & Zheng, P. Carbon-wrapped amorphous Ni–Co binary oxide nanosheet for high-performance pseudocapacitors. Appl. Phys. A 129, 57 (2023). https://doi.org/10.1007/s00339-022-06333-y

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